Facebook has just bought a popular new teen app called TBH. Teens have been flocking to the app named after the acronym frequently used in texts, “to be honest” to participate in anonymous polls and give feedback to friends.

The app creators control the content of the polls, like “Best person to go on a roadtrip with.” and the concept has spread like wildfire amongst teens.

The app is designed for people who are 13 and older, and according to the company, over 5 million people have downloaded it in just the past few weeks. And it’s only available on iOS for now.

Facebook confirmed the acquisition news but didn’t disclose terms of the deal but the social media company said tbh’s four co-creators Nikita Bier, Erik Hazzard, Kyle Zaragoza, and Nicolas Ducdodon will join Facebook’s Menlo Park headquarters.